Many microorganisms reside in human mucosa, specifically in the gut. There are many sources of the microorganisms that colonize our gut, and these sources are mainly environmental. Indeed, food is a major source of bacteria and viruses. Food also modifies the equilibrium of microorganisms in our gut, with vegetables favoring a wider diversity. The increasing role of industrial food in our alimentation is generating a globalization of our gut microbiota that may influence our health and aid the diffusion of clonal bacteria.